PHOENIX (KSAZ) - Authorities say three people are dead following a crash involving a wrong-way driver on a north Phoenix freeway.

The Arizona Department of Public Safety says the crash was caused by a wrong-way driver traveling southbound in the northbound lanes along Interstate 17 near Greenway Road on Friday at about 2:15 a.m.

A 21-year-old man who was driving the wrong way vehicle struck another vehicle carrying 18-and-20 year-old sisters. All three people were killed and two of the victims were reportedly students at Grand Canyon University.

On Saturday, the wrong-way driver was identified as Keaton Tyler Allison of Colorado Springs, Colorado. The victims, meanwhile, were identified by DPS as Karli Arlene Richardson, 20, and Kelsey Mae Richardson, 18. Both, according to DPS, are from Mooresville, North Carolina.